Loans - Wholesale Loan Portfolio, Nonaccrual Loans (Details) - Wholesale - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
With an allowance	$ 1,762	$ 1,397
Without an allowance	1,165	949
Total nonaccrual loans	2,927	2,346
Secured by real estate
Financing Receivable, Nonaccrual [Line Items]
With an allowance	128	129
Without an allowance	463	272
Total nonaccrual loans	591	401
Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
With an allowance	970	776
Without an allowance	465	445
Total nonaccrual loans	1,435	1,221
Other
Financing Receivable, Nonaccrual [Line Items]
With an allowance	664	492
Without an allowance	237	232
Total nonaccrual loans	$ 901	$ 724

Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Related Allowance

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

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- Details

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- Details

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